M Mayer

Publications (10)4.09 Total impact

• Article: Saturation of deuterium retention in self-damaged tungsten exposed to high-flux plasmas

  M.H.J. 't Hoen, B. Tyburska-Püschel, K. Ertl, M. Mayer, J. Rapp, A.W. Kleyn, P.A. Zeijlmans van Emmichoven
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  ABSTRACT: Polycrystalline, annealed tungsten targets were bombarded with 12.3 MeV W4+ ions to various damage levels. Deuterium was implanted by high-flux plasmas in Pilot-PSI (>1024 m−2 s−1) at a surface temperature below 525 K. Deuterium retention has been studied by nuclear reaction analysis and by thermal desorption spectroscopy. We found that deuterium retention is strongly enhanced by the tungsten bombardment and that saturation occurs at a W4+ fluence of about 3 × 1017 m−2. The maximum deuterium concentration in the damaged region was measured to be 1.4 at.%. This is in accordance with other experiments that were carried out at much lower fluxes. We therefore conclude that the saturation behaviour and the maximum retention are not affected by the high fluxes used in our experiments.A simple geometric model is presented that assumes that the saturation solely originates in the tungsten irradiation and that explains it in terms of overlapping saturated volumes. The saturated volume per incident MeV ion amounts to 3 × 104 nm3. From our results, we are able to obtain an approximate value for the average occupation number of the vacancies.
  Nuclear Fusion 01/2012; 52(2):023008. · 4.09 Impact Factor
• Article: Rutherford backscattering spectroscopy and elastic recoil detection analysis with lithium ions – The better alternative to helium?

  M. Mayer, J. Roth, K. Ertl
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  ABSTRACT: Rutherford backscattering spectroscopy (RBS) and elastic recoil detection analysis (ERDA) with lithium ions are compared to using helium ions. The availability and accuracy of backscattering cross-section and stopping power data for incident Li ions are reviewed, and energy broadening contributions due to detector resolution and energy loss straggling are discussed. Theoretical calculations of the depth resolution are compared with experimental data for RBS from Nb/Co multilayers and foil-ERDA from amorphous hydrogenated carbon multilayers. In RBS about the same or better depth resolution with Li than with He is achieved, while in ERDA for the detection of hydrogen isotopes the depth resolution is increased by a factor of about 1.5 compared to incident He.
  Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms.
• Source

  Available from: N. P. Barradas

  Article: Hydrogenic retention of high-Z refractory metals exposed to ITER divertor relevant plasma conditions

  G. M. Wright, E Alves, L. C. Alves, N. P. Barradas, R. S. Al, A. W. Kleyn, N. J. Lopes-Cardozo, M Mayer, H. J. van der Meiden, M.J. van de Pol, G. J. van Rooij, A E Shumack, W. A. J. Vijvers, J. Westerhout, J. Rapp
  Mateev, M.; Benova, E.: 36th European Physical Society Conference on Plasma Physics. Contributed Papers, European Physical Society (2009).
• Article: Hydrogenic Retention of High-Z Refractory Metals Exposed to ITER Divertor Relevant Ion Fluxes

  G. M. Wright, R. S. Al, E Alves, L. C. Alves, N. P. Barradas, A. W. Kleyn, N. J. Lopes-Cardozo, M Mayer, H. J. van der Meiden, M.J. van de Pol, G. J. van Rooij, A E Shumack, W. A. J. Vijvers, J. Westerhout, J. Rapp
• Article: Hydrogenic retention of high-Z refractory metals exposed to ITER divertor relevant plasma conditions

  G. M. Wright, E Alves, L. C. Alves, N. P. Barradas, M Mayer, G. J. van Rooij, J. Westerhout, R. S. Al, M. J. von de Pol, H. J. van der Meiden, J. Rapp, N. J. Lopes-Cardozo, A. W. Kleyn
  Fusion Energy 2008, International Atomic Energy Agency (2009).
• Article: Deuterium Retention in Pre-irradiated Tungsten Exposed to High-flux Plasma

  G. M. Wright, M Mayer, K. Ertl, G. de Saint-Aubin, J. Rapp
• Article: Hydrogenic retention in irradiated tungsten exposed to high-flux plasma

  G. M. Wright, M Mayer, K. Ertl, G. de Saint-Aubin, J. Rapp
  Nuclear Fusion, v.50 (2010).
• Article: Hyrogenic retention in tungsten exposed to high-flux plasmas

  P. A. Zeijlmans van Emmichoven, M. H. J. 't Hoen, G. M. Wright, M Mayer, K. Ertl, A. W. Kleyn, J. Rapp
• Article: Plasma-Facing Materials Research for Fusion Reactors at FOM Rijnhuizen

  J. Rapp, G. M. Wright, E Alves, L. C. Alves, N. P. Barradas, G. De Temmerman, K. Ertl, J. Linke, M Mayer, G. J. van Rooij, J. Westerhout, P. A. Zeijlmans van Emmichoven, A. W. Kleyn
• Article: Materials research under ITER-like divertor conditions at FOM Rijnhuizen

  G.M. Wright, J. Westerhout, R.S. Al, E. Alves, L.C. Alves, N.P. Barradas, M.A. van den Berg, D. Borodin, S. Brezinsek, S. Brons, [......], M. Mayer, H.J. van der Meiden, P.R. Prins, G.J. van Rooij, J. Scholten, A.E. Shumack, P.H.M. Smeets, G. De Temmerman, W.A.J. Vijvers, J. Rapp
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  ABSTRACT: At FOM Rijnhuizen, linear plasma generators are used to investigate plasma-material interactions under high-density (⩽1021 m−3), low-temperature (⩽5 eV) plasma bombardment. Research into carbon-based materials has been focused on chemical erosion by hydrogen plasmas. Results from plasma exposure to high-flux (>1023 H+/m2 s) and low-temperature hydrogen plasma indicate silicon carbide has a lower relative rate of gross erosion than other carbon-based materials (e.g. graphite, diamond, carbon-fiber composites) by a factor of 7–10. Hydrogenic retention is the focus of research on tungsten and molybdenum. For target temperatures of 700–1600 K, the temperature dependence of hydrogenic retention is the dominant factor. Damage to the surface by heavy ion irradiation has shown to enhance retention by a factor of 2.5–4.1. Thermal stressing of W via. e-beam thermal cycling also enhances hydrogenic retention by a factor of 2.1 ± 0.2, likely due to the introduction of thermal defects, which act as trapping sites for implanted hydrogenic isotopes.
  Journal of Nuclear Materials.